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Note The wizard does not enforce the order of the page views, so each page is free to specify any
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target page to go to next. In other words, just because the user is on page 2 does not mean she must view page 3 next.
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For instance, consider the account example mentioned at the beginning of this section. We require two pages, one for username and email, and the other for billing information. When we configure the Controller, we specify these page names in order. The configuration can be performed inside the Controller s constructor, shown by Listing 6-64. Listing 6-64. Constructor Configuration public CreateAccountWizardController() { setPages(new String[]{"usernameAndEmail", "billingDetails"}); } Or inside the bean definition, as is the case with Listing 6-65. Listing 6-65. XML Configuration <bean name="/createAccount" class="com.apress.expertspringmvc.flight.web.CreateAccountWizardController"> <property name="pages">
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CHAPTER 6 THE CONTROLLER MENAGERIE
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<list> <value>usernameAndEmail</value> <value>billingDetails</value> </list> </property> </bean> Either way is acceptable, but as we have mentioned before, if the list of pages for the wizard is fairly static, we prefer using the constructor method.
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Be aware that there is a single URI for the entire work flow, including all steps and the finish page. This effectively means that a user is prohibited from entering into the middle of a wizard. Luckily, this protects the wizard from ever being in an incorrect state. Any user who attempts to access the wizard via a bookmark will simply be presented with the first page of the wizard.
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Validation
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Just like SimpleFormController, the wizard controller supports one or more Validators. However, unlike SimpleFormController, the Validators are not automatically invoked during each request. Because each request only fills out some information of the command bean, the standard Validator has no way of knowing which properties of the command bean are missing or simply haven t been filled out yet. Therefore, doing a full validation of the command only makes sense at the end of the wizard. To validate the command object during the wizard, you must call the appropriate method on your Validator that matches the current page of the wizard. The controller provides a validatePage(Object command, Errors errors, int pageNumber) method for you to implement, where you will call the appropriate validateXxx() method on your Validator given the pageNumber. In other words, you must control how validation is to be performed, because the validate() method will not be called automatically. Note that at the end of the work flow, and on the _finish event, the controller will again loop through the number of pages and validate each again. This effectively validates the entire command object before the processFinish() method is called.
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Although life cycle handlers exist for wizard completion and wizard cancellation, you may also optionally implement postProcessPage() to perform some action after a normal page change request. This method is very useful when the state of the wizard must be persistent, allowing the user to come back and finish the work flow at a later time. If you wish to support something similar to this, persist the command bean inside postProcessPage() to somewhere more permanent than the HTTP session. You will most likely also need to override formBackingObject() to pull the command bean back out of persistence when the user begins the wizard again. Don t forget to also override getInitialPage(), which you can first check to see whether the user had already started the work flow earlier and return the page he left off on.
CHAPTER 6 THE CONTROLLER MENAGERIE
Work Flow Cancellation
Optionally, you may decide to allow the user to cancel out of the work flow at any time by overriding the processCancel() method. This allows you to perform any cleanup that might have built up during the wizard. The default state change trigger is the presence of a _cancel request parameter, but you may change the heuristics by overriding isCancelRequest(). You do not need to remove the command object from the session, as that is handled for you by the Controller. At the very least, simply return a ModelAndView instance directing the user to the appropriate page.
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